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Related Concept Videos

Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Breaking the Trade-Off Between Activity and Stability in Reverse Water-Gas Shift Reaction by Forming Highly Active

Jing Xu1, Lingling Zhang1, Meng Zhao1

  • 1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.

Angewandte Chemie (International Ed. in English)
|December 13, 2025
PubMed
Summary

This study introduces a novel dual ligand-protected strategy for enhanced reverse water gas shift (RWGS) catalysts. The new Pt-Na silicalite-1 framework shows improved activity and stability for efficient CO2 conversion.

Keywords:
EncapsulationHeterogeneous catalysisPlatinumRWGS reactionZeolite

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Area of Science:

  • Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • The reverse water gas shift (RWGS) reaction is crucial for industrial applications.
  • Alkali metals improve RWGS catalyst activity but not stability.
  • Zeolite encapsulation enhances stability but complicates control over active sites, impacting activity.

Purpose of the Study:

  • To develop a dual ligand-protected strategy for controlling Pt and Na species hybridization within silicalite-1 (S1) frameworks.
  • To achieve simultaneously improved activity and stability in RWGS catalysts.
  • To investigate the mechanistic origins of enhanced catalytic performance.

Main Methods:

  • Synthesis of a dual ligand-protected Pt-Na silicalite-1 (S1) catalyst.
  • Catalytic performance evaluation for the RWGS reaction.
  • Accelerated aging tests to assess stability.
  • Mechanistic investigations using spectroscopic and computational methods.

Main Results:

  • The developed catalyst achieved a high turnover frequency (TOF) of 207,156.4 h⁻¹ with 100% CO selectivity at 350°C.
  • The catalyst demonstrated excellent stability, retaining high activity after accelerated aging at 800°C.
  • A novel Pt─O─Na─Si unit was identified within the S1 framework, featuring a skeletal oxygen coordinating with Na⁺ and Pt.

Conclusions:

  • The dual ligand-protected strategy effectively controls Pt and Na hybridization in S1, leading to superior RWGS catalyst performance.
  • The formation of the Pt─O─Na─Si unit and the resulting elevated Pt oxidation state are key to enhanced activity and stability.
  • This approach offers a promising pathway for designing next-generation RWGS catalysts with improved efficiency and durability.